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<title>class Test::Unit::Diff::ReadableDiffer - test-unit: Ruby Standard Library Documentation</title>


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  <h3>Parent</h3>

  <p class="link"><a href="Differ.html">Test::Unit::Diff::Differ</a>
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<!-- Method Quickref -->
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  <h3>Methods</h3>

  <ul class="link-list" role="directory">
    <li ><a href="#method-i-_diff_lines">#_diff_lines</a>
    <li ><a href="#method-i-compute_width">#compute_width</a>
    <li ><a href="#method-i-cut_off_ratio">#cut_off_ratio</a>
    <li ><a href="#method-i-default_ratio">#default_ratio</a>
    <li ><a href="#method-i-diff">#diff</a>
    <li ><a href="#method-i-diff_line">#diff_line</a>
    <li ><a href="#method-i-diff_lines">#diff_lines</a>
    <li ><a href="#method-i-find_diff_line_info">#find_diff_line_info</a>
    <li ><a href="#method-i-format_diff_point">#format_diff_point</a>
    <li ><a href="#method-i-line_operations">#line_operations</a>
    <li ><a href="#method-i-n_leading_characters">#n_leading_characters</a>
    <li ><a href="#method-i-operations">#operations</a>
    <li ><a href="#method-i-space_character-3F">#space_character?</a>
    <li ><a href="#method-i-tag">#tag</a>
    <li ><a href="#method-i-tag_deleted">#tag_deleted</a>
    <li ><a href="#method-i-tag_difference">#tag_difference</a>
    <li ><a href="#method-i-tag_equal">#tag_equal</a>
    <li ><a href="#method-i-tag_inserted">#tag_inserted</a>
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    <main role="main" aria-labelledby="class-Test::Unit::Diff::ReadableDiffer">
    <h1 id="class-Test::Unit::Diff::ReadableDiffer" class="class">
      class Test::Unit::Diff::ReadableDiffer
    </h1>

    <section class="description">
    
    </section>

      <section id="5Buntitled-5D" class="documentation-section">





                <section id="public-instance-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Public Instance Methods</h3>
                </header>

                  <div id="method-i-diff" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">diff</span><span
                                class="method-args">(options={})</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="diff-source">
            <pre><span class="ruby-comment"># File test-unit-3.6.1/lib/test/unit/diff.rb, line 413</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">diff</span>(<span class="ruby-identifier">options</span>={})
  <span class="ruby-ivar">@result</span> = []
  <span class="ruby-identifier">operations</span>.<span class="ruby-identifier">each</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">tag</span>, <span class="ruby-identifier">from_start</span>, <span class="ruby-identifier">from_end</span>, <span class="ruby-identifier">to_start</span>, <span class="ruby-identifier">to_end</span><span class="ruby-operator">|</span>
    <span class="ruby-keyword">case</span> <span class="ruby-identifier">tag</span>
    <span class="ruby-keyword">when</span> <span class="ruby-value">:replace</span>
      <span class="ruby-identifier">diff_lines</span>(<span class="ruby-identifier">from_start</span>, <span class="ruby-identifier">from_end</span>, <span class="ruby-identifier">to_start</span>, <span class="ruby-identifier">to_end</span>)
    <span class="ruby-keyword">when</span> <span class="ruby-value">:delete</span>
      <span class="ruby-identifier">tag_deleted</span>(<span class="ruby-ivar">@from</span>[<span class="ruby-identifier">from_start</span><span class="ruby-operator">...</span><span class="ruby-identifier">from_end</span>])
    <span class="ruby-keyword">when</span> <span class="ruby-value">:insert</span>
      <span class="ruby-identifier">tag_inserted</span>(<span class="ruby-ivar">@to</span>[<span class="ruby-identifier">to_start</span><span class="ruby-operator">...</span><span class="ruby-identifier">to_end</span>])
    <span class="ruby-keyword">when</span> <span class="ruby-value">:equal</span>
      <span class="ruby-identifier">tag_equal</span>(<span class="ruby-ivar">@from</span>[<span class="ruby-identifier">from_start</span><span class="ruby-operator">...</span><span class="ruby-identifier">from_end</span>])
    <span class="ruby-keyword">else</span>
      <span class="ruby-identifier">raise</span> <span class="ruby-node">&quot;unknown tag: #{tag}&quot;</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>
  <span class="ruby-ivar">@result</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                          </section>

                <section id="private-instance-5Buntitled-5D-method-details" class="method-section">
                <header>
                <h3>Private Instance Methods</h3>
                </header>

                  <div id="method-i-_diff_lines" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">_diff_lines</span><span
                                class="method-args">(from_start, from_end, to_start, to_end)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="_diff_lines-source">
            <pre><span class="ruby-comment"># File test-unit-3.6.1/lib/test/unit/diff.rb, line 528</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">_diff_lines</span>(<span class="ruby-identifier">from_start</span>, <span class="ruby-identifier">from_end</span>, <span class="ruby-identifier">to_start</span>, <span class="ruby-identifier">to_end</span>)
  <span class="ruby-keyword">if</span> <span class="ruby-identifier">from_start</span> <span class="ruby-operator">&lt;</span> <span class="ruby-identifier">from_end</span>
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">to_start</span> <span class="ruby-operator">&lt;</span> <span class="ruby-identifier">to_end</span>
      <span class="ruby-identifier">diff_lines</span>(<span class="ruby-identifier">from_start</span>, <span class="ruby-identifier">from_end</span>, <span class="ruby-identifier">to_start</span>, <span class="ruby-identifier">to_end</span>)
    <span class="ruby-keyword">else</span>
      <span class="ruby-identifier">tag_deleted</span>(<span class="ruby-ivar">@from</span>[<span class="ruby-identifier">from_start</span><span class="ruby-operator">...</span><span class="ruby-identifier">from_end</span>])
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">else</span>
    <span class="ruby-identifier">tag_inserted</span>(<span class="ruby-ivar">@to</span>[<span class="ruby-identifier">to_start</span><span class="ruby-operator">...</span><span class="ruby-identifier">to_end</span>])
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-compute_width" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">compute_width</span><span
                                class="method-args">(line, start, _end)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="compute_width-source">
            <pre><span class="ruby-comment"># File test-unit-3.6.1/lib/test/unit/diff.rb, line 550</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">compute_width</span>(<span class="ruby-identifier">line</span>, <span class="ruby-identifier">start</span>, <span class="ruby-identifier">_end</span>)
  <span class="ruby-keyword">if</span> <span class="ruby-identifier">line</span>.<span class="ruby-identifier">respond_to?</span>(<span class="ruby-value">:encoding</span>) <span class="ruby-keyword">and</span>
      <span class="ruby-constant">Encoding</span>.<span class="ruby-identifier">compatible?</span>(<span class="ruby-constant">Encoding</span><span class="ruby-operator">::</span><span class="ruby-constant">UTF_8</span>, <span class="ruby-identifier">line</span>.<span class="ruby-identifier">encoding</span>)
    <span class="ruby-identifier">utf8_line</span> = <span class="ruby-identifier">line</span>[<span class="ruby-identifier">start</span><span class="ruby-operator">...</span><span class="ruby-identifier">_end</span>].<span class="ruby-identifier">encode</span>(<span class="ruby-constant">Encoding</span><span class="ruby-operator">::</span><span class="ruby-constant">UTF_8</span>)
    <span class="ruby-identifier">width</span> = <span class="ruby-value">0</span>
    <span class="ruby-identifier">utf8_line</span>.<span class="ruby-identifier">each_codepoint</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">unicode_codepoint</span><span class="ruby-operator">|</span>
      <span class="ruby-keyword">if</span> <span class="ruby-constant">UTF8Line</span>.<span class="ruby-identifier">wide_character?</span>(<span class="ruby-identifier">unicode_codepoint</span>)
        <span class="ruby-identifier">width</span> <span class="ruby-operator">+=</span> <span class="ruby-value">2</span>
      <span class="ruby-keyword">else</span>
        <span class="ruby-identifier">width</span> <span class="ruby-operator">+=</span> <span class="ruby-value">1</span>
      <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">end</span>
    <span class="ruby-identifier">width</span>
  <span class="ruby-keyword">elsif</span> <span class="ruby-identifier">line</span>.<span class="ruby-identifier">is_a?</span>(<span class="ruby-constant">UTF8Line</span>)
    <span class="ruby-identifier">line</span>.<span class="ruby-identifier">compute_width</span>(<span class="ruby-identifier">start</span>, <span class="ruby-identifier">_end</span>)
  <span class="ruby-keyword">else</span>
    <span class="ruby-identifier">_end</span> <span class="ruby-operator">-</span> <span class="ruby-identifier">start</span>
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-cut_off_ratio" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">cut_off_ratio</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="cut_off_ratio-source">
            <pre><span class="ruby-comment"># File test-unit-3.6.1/lib/test/unit/diff.rb, line 446</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">cut_off_ratio</span>
  <span class="ruby-value">0.75</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-default_ratio" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">default_ratio</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="default_ratio-source">
            <pre><span class="ruby-comment"># File test-unit-3.6.1/lib/test/unit/diff.rb, line 442</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">default_ratio</span>
  <span class="ruby-value">0.74</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-diff_line" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">diff_line</span><span
                                class="method-args">(from_line, to_line)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="diff_line-source">
            <pre><span class="ruby-comment"># File test-unit-3.6.1/lib/test/unit/diff.rb, line 570</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">diff_line</span>(<span class="ruby-identifier">from_line</span>, <span class="ruby-identifier">to_line</span>)
  <span class="ruby-identifier">from_tags</span> = <span class="ruby-string">&quot;&quot;</span>
  <span class="ruby-identifier">to_tags</span> = <span class="ruby-string">&quot;&quot;</span>
  <span class="ruby-identifier">from_line</span>, <span class="ruby-identifier">to_line</span>, <span class="ruby-identifier">_operations</span> = <span class="ruby-identifier">line_operations</span>(<span class="ruby-identifier">from_line</span>, <span class="ruby-identifier">to_line</span>)
  <span class="ruby-identifier">_operations</span>.<span class="ruby-identifier">each</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">tag</span>, <span class="ruby-identifier">from_start</span>, <span class="ruby-identifier">from_end</span>, <span class="ruby-identifier">to_start</span>, <span class="ruby-identifier">to_end</span><span class="ruby-operator">|</span>
    <span class="ruby-identifier">from_width</span> = <span class="ruby-identifier">compute_width</span>(<span class="ruby-identifier">from_line</span>, <span class="ruby-identifier">from_start</span>, <span class="ruby-identifier">from_end</span>)
    <span class="ruby-identifier">to_width</span> = <span class="ruby-identifier">compute_width</span>(<span class="ruby-identifier">to_line</span>, <span class="ruby-identifier">to_start</span>, <span class="ruby-identifier">to_end</span>)
    <span class="ruby-keyword">case</span> <span class="ruby-identifier">tag</span>
    <span class="ruby-keyword">when</span> <span class="ruby-value">:replace</span>
      <span class="ruby-identifier">from_tags</span> <span class="ruby-operator">+=</span> <span class="ruby-string">&quot;^&quot;</span> <span class="ruby-operator">*</span> <span class="ruby-identifier">from_width</span>
      <span class="ruby-identifier">to_tags</span> <span class="ruby-operator">+=</span> <span class="ruby-string">&quot;^&quot;</span> <span class="ruby-operator">*</span> <span class="ruby-identifier">to_width</span>
    <span class="ruby-keyword">when</span> <span class="ruby-value">:delete</span>
      <span class="ruby-identifier">from_tags</span> <span class="ruby-operator">+=</span> <span class="ruby-string">&quot;-&quot;</span> <span class="ruby-operator">*</span> <span class="ruby-identifier">from_width</span>
    <span class="ruby-keyword">when</span> <span class="ruby-value">:insert</span>
      <span class="ruby-identifier">to_tags</span> <span class="ruby-operator">+=</span> <span class="ruby-string">&quot;+&quot;</span> <span class="ruby-operator">*</span> <span class="ruby-identifier">to_width</span>
    <span class="ruby-keyword">when</span> <span class="ruby-value">:equal</span>
      <span class="ruby-identifier">from_tags</span> <span class="ruby-operator">+=</span> <span class="ruby-string">&quot; &quot;</span> <span class="ruby-operator">*</span> <span class="ruby-identifier">from_width</span>
      <span class="ruby-identifier">to_tags</span> <span class="ruby-operator">+=</span> <span class="ruby-string">&quot; &quot;</span> <span class="ruby-operator">*</span> <span class="ruby-identifier">to_width</span>
    <span class="ruby-keyword">else</span>
      <span class="ruby-identifier">raise</span> <span class="ruby-node">&quot;unknown tag: #{tag}&quot;</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>
  <span class="ruby-identifier">format_diff_point</span>(<span class="ruby-identifier">from_line</span>, <span class="ruby-identifier">to_line</span>, <span class="ruby-identifier">from_tags</span>, <span class="ruby-identifier">to_tags</span>)
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-diff_lines" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">diff_lines</span><span
                                class="method-args">(from_start, from_end, to_start, to_end)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="diff_lines-source">
            <pre><span class="ruby-comment"># File test-unit-3.6.1/lib/test/unit/diff.rb, line 500</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">diff_lines</span>(<span class="ruby-identifier">from_start</span>, <span class="ruby-identifier">from_end</span>, <span class="ruby-identifier">to_start</span>, <span class="ruby-identifier">to_end</span>)
  <span class="ruby-identifier">info</span> = <span class="ruby-identifier">find_diff_line_info</span>(<span class="ruby-identifier">from_start</span>, <span class="ruby-identifier">from_end</span>, <span class="ruby-identifier">to_start</span>, <span class="ruby-identifier">to_end</span>)
  <span class="ruby-identifier">best_ratio</span>, <span class="ruby-identifier">from_equal_index</span>, <span class="ruby-identifier">to_equal_index</span>, <span class="ruby-operator">*</span><span class="ruby-identifier">info</span> = <span class="ruby-identifier">info</span>
  <span class="ruby-identifier">from_best_index</span>, <span class="ruby-identifier">to_best_index</span> = <span class="ruby-identifier">info</span>
  <span class="ruby-identifier">from_best_index</span> <span class="ruby-operator">||=</span> <span class="ruby-identifier">from_start</span>
  <span class="ruby-identifier">to_best_index</span> <span class="ruby-operator">||=</span> <span class="ruby-identifier">to_start</span>

  <span class="ruby-keyword">if</span> <span class="ruby-identifier">best_ratio</span> <span class="ruby-operator">&lt;</span> <span class="ruby-identifier">cut_off_ratio</span>
    <span class="ruby-keyword">if</span> <span class="ruby-identifier">from_equal_index</span>.<span class="ruby-identifier">nil?</span>
      <span class="ruby-keyword">if</span> <span class="ruby-identifier">to_end</span> <span class="ruby-operator">-</span> <span class="ruby-identifier">to_start</span> <span class="ruby-operator">&lt;</span> <span class="ruby-identifier">from_end</span> <span class="ruby-operator">-</span> <span class="ruby-identifier">from_start</span>
        <span class="ruby-identifier">tag_inserted</span>(<span class="ruby-ivar">@to</span>[<span class="ruby-identifier">to_start</span><span class="ruby-operator">...</span><span class="ruby-identifier">to_end</span>])
        <span class="ruby-identifier">tag_deleted</span>(<span class="ruby-ivar">@from</span>[<span class="ruby-identifier">from_start</span><span class="ruby-operator">...</span><span class="ruby-identifier">from_end</span>])
      <span class="ruby-keyword">else</span>
        <span class="ruby-identifier">tag_deleted</span>(<span class="ruby-ivar">@from</span>[<span class="ruby-identifier">from_start</span><span class="ruby-operator">...</span><span class="ruby-identifier">from_end</span>])
        <span class="ruby-identifier">tag_inserted</span>(<span class="ruby-ivar">@to</span>[<span class="ruby-identifier">to_start</span><span class="ruby-operator">...</span><span class="ruby-identifier">to_end</span>])
      <span class="ruby-keyword">end</span>
      <span class="ruby-keyword">return</span>
    <span class="ruby-keyword">end</span>
    <span class="ruby-identifier">from_best_index</span> = <span class="ruby-identifier">from_equal_index</span>
    <span class="ruby-identifier">to_best_index</span> = <span class="ruby-identifier">to_equal_index</span>
    <span class="ruby-identifier">best_ratio</span> = <span class="ruby-value">1.0</span>
  <span class="ruby-keyword">end</span>

  <span class="ruby-identifier">_diff_lines</span>(<span class="ruby-identifier">from_start</span>, <span class="ruby-identifier">from_best_index</span>, <span class="ruby-identifier">to_start</span>, <span class="ruby-identifier">to_best_index</span>)
  <span class="ruby-identifier">diff_line</span>(<span class="ruby-ivar">@from</span>[<span class="ruby-identifier">from_best_index</span>], <span class="ruby-ivar">@to</span>[<span class="ruby-identifier">to_best_index</span>])
  <span class="ruby-identifier">_diff_lines</span>(<span class="ruby-identifier">from_best_index</span> <span class="ruby-operator">+</span> <span class="ruby-value">1</span>, <span class="ruby-identifier">from_end</span>, <span class="ruby-identifier">to_best_index</span> <span class="ruby-operator">+</span> <span class="ruby-value">1</span>, <span class="ruby-identifier">to_end</span>)
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-find_diff_line_info" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">find_diff_line_info</span><span
                                class="method-args">(from_start, from_end, to_start, to_end)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="find_diff_line_info-source">
            <pre><span class="ruby-comment"># File test-unit-3.6.1/lib/test/unit/diff.rb, line 472</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">find_diff_line_info</span>(<span class="ruby-identifier">from_start</span>, <span class="ruby-identifier">from_end</span>, <span class="ruby-identifier">to_start</span>, <span class="ruby-identifier">to_end</span>)
  <span class="ruby-identifier">best_ratio</span> = <span class="ruby-identifier">default_ratio</span>
  <span class="ruby-identifier">from_equal_index</span> = <span class="ruby-identifier">to_equal_index</span> = <span class="ruby-keyword">nil</span>
  <span class="ruby-identifier">from_best_index</span> = <span class="ruby-identifier">to_best_index</span> = <span class="ruby-keyword">nil</span>

  <span class="ruby-identifier">to_start</span>.<span class="ruby-identifier">upto</span>(<span class="ruby-identifier">to_end</span> <span class="ruby-operator">-</span> <span class="ruby-value">1</span>) <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">to_index</span><span class="ruby-operator">|</span>
    <span class="ruby-identifier">from_start</span>.<span class="ruby-identifier">upto</span>(<span class="ruby-identifier">from_end</span> <span class="ruby-operator">-</span> <span class="ruby-value">1</span>) <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">from_index</span><span class="ruby-operator">|</span>
      <span class="ruby-keyword">if</span> <span class="ruby-ivar">@from</span>[<span class="ruby-identifier">from_index</span>] <span class="ruby-operator">==</span> <span class="ruby-ivar">@to</span>[<span class="ruby-identifier">to_index</span>]
        <span class="ruby-identifier">from_equal_index</span> <span class="ruby-operator">||=</span> <span class="ruby-identifier">from_index</span>
        <span class="ruby-identifier">to_equal_index</span> <span class="ruby-operator">||=</span> <span class="ruby-identifier">to_index</span>
        <span class="ruby-keyword">next</span>
      <span class="ruby-keyword">end</span>

      <span class="ruby-identifier">matcher</span> = <span class="ruby-constant">SequenceMatcher</span>.<span class="ruby-identifier">new</span>(<span class="ruby-ivar">@from</span>[<span class="ruby-identifier">from_index</span>], <span class="ruby-ivar">@to</span>[<span class="ruby-identifier">to_index</span>],
                                    <span class="ruby-operator">&amp;</span><span class="ruby-identifier">method</span>(<span class="ruby-value">:space_character?</span>))
      <span class="ruby-keyword">if</span> <span class="ruby-identifier">matcher</span>.<span class="ruby-identifier">ratio</span> <span class="ruby-operator">&gt;</span> <span class="ruby-identifier">best_ratio</span>
        <span class="ruby-identifier">best_ratio</span> = <span class="ruby-identifier">matcher</span>.<span class="ruby-identifier">ratio</span>
        <span class="ruby-identifier">from_best_index</span> = <span class="ruby-identifier">from_index</span>
        <span class="ruby-identifier">to_best_index</span> = <span class="ruby-identifier">to_index</span>
      <span class="ruby-keyword">end</span>
    <span class="ruby-keyword">end</span>
  <span class="ruby-keyword">end</span>

  [<span class="ruby-identifier">best_ratio</span>,
   <span class="ruby-identifier">from_equal_index</span>, <span class="ruby-identifier">to_equal_index</span>,
   <span class="ruby-identifier">from_best_index</span>,  <span class="ruby-identifier">to_best_index</span>]
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-format_diff_point" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">format_diff_point</span><span
                                class="method-args">(from_line, to_line, from_tags, to_tags)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="format_diff_point-source">
            <pre><span class="ruby-comment"># File test-unit-3.6.1/lib/test/unit/diff.rb, line 595</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">format_diff_point</span>(<span class="ruby-identifier">from_line</span>, <span class="ruby-identifier">to_line</span>, <span class="ruby-identifier">from_tags</span>, <span class="ruby-identifier">to_tags</span>)
  <span class="ruby-identifier">common</span> = [<span class="ruby-identifier">n_leading_characters</span>(<span class="ruby-identifier">from_line</span>, <span class="ruby-value">?\t</span>),
            <span class="ruby-identifier">n_leading_characters</span>(<span class="ruby-identifier">to_line</span>, <span class="ruby-value">?\t</span>)].<span class="ruby-identifier">min</span>
  <span class="ruby-identifier">common</span> = [<span class="ruby-identifier">common</span>,
            <span class="ruby-identifier">n_leading_characters</span>(<span class="ruby-identifier">from_tags</span>[<span class="ruby-value">0</span>, <span class="ruby-identifier">common</span>], <span class="ruby-string">&quot; &quot;</span>[<span class="ruby-value">0</span>])].<span class="ruby-identifier">min</span>
  <span class="ruby-identifier">from_tags</span> = <span class="ruby-identifier">from_tags</span>[<span class="ruby-identifier">common</span><span class="ruby-operator">..</span><span class="ruby-value">-1</span>].<span class="ruby-identifier">rstrip</span>
  <span class="ruby-identifier">to_tags</span> = <span class="ruby-identifier">to_tags</span>[<span class="ruby-identifier">common</span><span class="ruby-operator">..</span><span class="ruby-value">-1</span>].<span class="ruby-identifier">rstrip</span>

  <span class="ruby-identifier">tag_deleted</span>([<span class="ruby-identifier">from_line</span>])
  <span class="ruby-keyword">unless</span> <span class="ruby-identifier">from_tags</span>.<span class="ruby-identifier">empty?</span>
    <span class="ruby-identifier">tag_difference</span>([<span class="ruby-node">&quot;#{&quot;\t&quot; * common}#{from_tags}&quot;</span>])
  <span class="ruby-keyword">end</span>
  <span class="ruby-identifier">tag_inserted</span>([<span class="ruby-identifier">to_line</span>])
  <span class="ruby-keyword">unless</span> <span class="ruby-identifier">to_tags</span>.<span class="ruby-identifier">empty?</span>
    <span class="ruby-identifier">tag_difference</span>([<span class="ruby-node">&quot;#{&quot;\t&quot; * common}#{to_tags}&quot;</span>])
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-line_operations" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">line_operations</span><span
                                class="method-args">(from_line, to_line)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="line_operations-source">
            <pre><span class="ruby-comment"># File test-unit-3.6.1/lib/test/unit/diff.rb, line 540</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">line_operations</span>(<span class="ruby-identifier">from_line</span>, <span class="ruby-identifier">to_line</span>)
  <span class="ruby-keyword">if</span> <span class="ruby-operator">!</span><span class="ruby-identifier">from_line</span>.<span class="ruby-identifier">respond_to?</span>(<span class="ruby-value">:force_encoding</span>) <span class="ruby-keyword">and</span> <span class="ruby-identifier">$KCODE</span> <span class="ruby-operator">==</span> <span class="ruby-string">&quot;UTF8&quot;</span>
    <span class="ruby-identifier">from_line</span> = <span class="ruby-constant">UTF8Line</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">from_line</span>)
    <span class="ruby-identifier">to_line</span> = <span class="ruby-constant">UTF8Line</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">to_line</span>)
  <span class="ruby-keyword">end</span>
  <span class="ruby-identifier">matcher</span> = <span class="ruby-constant">SequenceMatcher</span>.<span class="ruby-identifier">new</span>(<span class="ruby-identifier">from_line</span>, <span class="ruby-identifier">to_line</span>,
                                <span class="ruby-operator">&amp;</span><span class="ruby-identifier">method</span>(<span class="ruby-value">:space_character?</span>))
  [<span class="ruby-identifier">from_line</span>, <span class="ruby-identifier">to_line</span>, <span class="ruby-identifier">matcher</span>.<span class="ruby-identifier">operations</span>]
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-n_leading_characters" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">n_leading_characters</span><span
                                class="method-args">(string, character)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="n_leading_characters-source">
            <pre><span class="ruby-comment"># File test-unit-3.6.1/lib/test/unit/diff.rb, line 613</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">n_leading_characters</span>(<span class="ruby-identifier">string</span>, <span class="ruby-identifier">character</span>)
  <span class="ruby-identifier">n</span> = <span class="ruby-value">0</span>
  <span class="ruby-keyword">while</span> <span class="ruby-identifier">string</span>[<span class="ruby-identifier">n</span>] <span class="ruby-operator">==</span> <span class="ruby-identifier">character</span>
    <span class="ruby-identifier">n</span> <span class="ruby-operator">+=</span> <span class="ruby-value">1</span>
  <span class="ruby-keyword">end</span>
  <span class="ruby-identifier">n</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-operations" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">operations</span><span
                                class="method-args">()</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="operations-source">
            <pre><span class="ruby-comment"># File test-unit-3.6.1/lib/test/unit/diff.rb, line 433</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">operations</span>
  <span class="ruby-ivar">@operations</span> <span class="ruby-operator">||=</span> <span class="ruby-keyword">nil</span>
  <span class="ruby-keyword">if</span> <span class="ruby-ivar">@operations</span>.<span class="ruby-identifier">nil?</span>
    <span class="ruby-identifier">matcher</span> = <span class="ruby-constant">SequenceMatcher</span>.<span class="ruby-identifier">new</span>(<span class="ruby-ivar">@from</span>, <span class="ruby-ivar">@to</span>)
    <span class="ruby-ivar">@operations</span> = <span class="ruby-identifier">matcher</span>.<span class="ruby-identifier">operations</span>
  <span class="ruby-keyword">end</span>
  <span class="ruby-ivar">@operations</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-space_character-3F" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">space_character?</span><span
                                class="method-args">(character)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="space_character-3F-source">
            <pre><span class="ruby-comment"># File test-unit-3.6.1/lib/test/unit/diff.rb, line 621</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">space_character?</span>(<span class="ruby-identifier">character</span>)
  [<span class="ruby-string">&quot; &quot;</span>[<span class="ruby-value">0</span>], <span class="ruby-string">&quot;\t&quot;</span>[<span class="ruby-value">0</span>]].<span class="ruby-identifier">include?</span>(<span class="ruby-identifier">character</span>)
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-tag" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">tag</span><span
                                class="method-args">(mark, contents)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="tag-source">
            <pre><span class="ruby-comment"># File test-unit-3.6.1/lib/test/unit/diff.rb, line 450</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">tag</span>(<span class="ruby-identifier">mark</span>, <span class="ruby-identifier">contents</span>)
  <span class="ruby-identifier">contents</span>.<span class="ruby-identifier">each</span> <span class="ruby-keyword">do</span> <span class="ruby-operator">|</span><span class="ruby-identifier">content</span><span class="ruby-operator">|</span>
    <span class="ruby-ivar">@result</span> <span class="ruby-operator">&lt;&lt;</span> (<span class="ruby-identifier">mark</span> <span class="ruby-operator">+</span> <span class="ruby-identifier">content</span>)
  <span class="ruby-keyword">end</span>
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-tag_deleted" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">tag_deleted</span><span
                                class="method-args">(contents)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="tag_deleted-source">
            <pre><span class="ruby-comment"># File test-unit-3.6.1/lib/test/unit/diff.rb, line 456</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">tag_deleted</span>(<span class="ruby-identifier">contents</span>)
  <span class="ruby-identifier">tag</span>(<span class="ruby-string">&quot;- &quot;</span>, <span class="ruby-identifier">contents</span>)
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-tag_difference" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">tag_difference</span><span
                                class="method-args">(contents)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="tag_difference-source">
            <pre><span class="ruby-comment"># File test-unit-3.6.1/lib/test/unit/diff.rb, line 468</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">tag_difference</span>(<span class="ruby-identifier">contents</span>)
  <span class="ruby-identifier">tag</span>(<span class="ruby-string">&quot;? &quot;</span>, <span class="ruby-identifier">contents</span>)
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-tag_equal" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">tag_equal</span><span
                                class="method-args">(contents)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="tag_equal-source">
            <pre><span class="ruby-comment"># File test-unit-3.6.1/lib/test/unit/diff.rb, line 464</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">tag_equal</span>(<span class="ruby-identifier">contents</span>)
  <span class="ruby-identifier">tag</span>(<span class="ruby-string">&quot;  &quot;</span>, <span class="ruby-identifier">contents</span>)
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

                  <div id="method-i-tag_inserted" class="method-detail ">
                            <div class="method-heading">
                              <span class="method-name">tag_inserted</span><span
                                class="method-args">(contents)</span>
                              <span class="method-click-advice">click to toggle source</span>
                            </div>

                            <div class="method-description">
                              

                              <div class="method-source-code" id="tag_inserted-source">
            <pre><span class="ruby-comment"># File test-unit-3.6.1/lib/test/unit/diff.rb, line 460</span>
<span class="ruby-keyword">def</span> <span class="ruby-identifier ruby-title">tag_inserted</span>(<span class="ruby-identifier">contents</span>)
  <span class="ruby-identifier">tag</span>(<span class="ruby-string">&quot;+ &quot;</span>, <span class="ruby-identifier">contents</span>)
<span class="ruby-keyword">end</span></pre>
                              </div>
                            </div>


                          </div>

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